In Part 1 this video I'll show you how to mount and new speaker in a Laney SuperCub 12, and while you're at it replace the grille clothe. It's very easy to do both jobs, the main thing when replacing the speaker is because the cabinet isn't very deep, you'll need to be careful that the speaker you've chosen isn't too deep or you won't be able to replace the amp chassis afterwards. This is one reason I've chosen a Celestion Neo Creamback, the other reason of course being that it's very light (although to be fair the stock speaker, a Laney HH1265 is the same sort of weight too, so you won't make the amp lighter, but you will keep it in the same ballpark that you're used to.